﻿/*
 * Authors:
 *   钟峰(Popeye Zhong) <zongsoft@gmail.com>
 *
 * Copyright (C) 2016-2017 Zongsoft Corporation <http://www.zongsoft.com>
 *
 * This file is part of Zongsoft.CoreLibrary.
 *
 * Zongsoft.CoreLibrary is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * Zongsoft.CoreLibrary is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 *
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with Zongsoft.CoreLibrary; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

using System;
using System.Collections.Generic;

namespace Zongsoft.Collections
{
	public static class KeyValuePairExtension
	{
		#region 公共方法
		public static KeyValuePair<string, object>[] CreatePairs(string[] keys, params object[] values)
		{
			if(keys == null)
				throw new ArgumentNullException(nameof(keys));

			var result = new KeyValuePair<string, object>[keys.Length];

			for(int i = 0; i < result.Length; i++)
			{
				result[i] = new KeyValuePair<string, object>(keys[i], (values != null && i < values.Length ? values[i] : null));
			}

			return result;
		}

		public static KeyValuePair<string, object>[] CreatePairs(object[] values, params string[] keys)
		{
			if(keys == null)
				throw new ArgumentNullException(nameof(keys));

			var result = new KeyValuePair<string, object>[keys.Length];

			for(int i = 0; i < result.Length; i++)
			{
				result[i] = new KeyValuePair<string, object>(keys[i], (values != null && i < values.Length ? values[i] : null));
			}

			return result;
		}

		public static object[] ToArray(this KeyValuePair<string, object>[] pairs)
		{
			if(pairs == null)
				return null;

			var array = new object[pairs.Length];
			Array.Copy(pairs, array, array.Length);
			return array;
		}
		#endregion
	}
}
